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Dewey Summaries as Multilingual Linked Data Dewey Breakfast/Update ALA Annual July 11, 2009 Linked Data principles • Three rules 1. Use http-URIs as names for things (identification) 2. When someone looks up a URI, provide useful information (dereferenceability) 3. Include links to other URIs (relationships) • Maxims • “Raw data now!” (TBL) • Being able to ask new question about data • Adding information collaboratively Linked Open Data cloud Requirements for publishing Linked Data - Identification - Every data entity has a URI - Access - HTTP as protocol (established infrastructure: WWW) - User agent indicates which data formats it accepts - Representation - for machines - RDF as data model - SKOS, Dublin Core, ccREL, etc. as vocabularies - for humans - HTML, etc. - “Openness” of the data set Use Cases: Basic web lookup “If someone has the URI of that thing, what relationships to what other objects is it useful to know about?” (Tim Berners-Lee) A web page for every class of the Dewey Summaries, e.g.: <http://dewey.info/class/641/> Use Cases: Basic linking Example: Dublin Core metadata <dc:title>Petrology.</dc:title> <dc:creator>Huang, Walter Ta, 1924-</dc:creator> <dc:subject xsi:type="http://purl.org/dc/terms/DDC">552</dc:subject> Use of a link (URI) instead of arbitrary text Use Cases: Basic linking Example: Dublin Core metadata <dc:title>Petrology.</dc:title> <dc:creator>Huang, Walter Ta, 1924-</dc:creator> <dc:subject rdf:resource="http://dewey.info/class/552/e16/" /> Use of a link (URI) instead of arbitrary text Service: Dewey Summaries as Linked Data - External summaries of DDC 22 - Main Classes, Divisions, Sections - Accessible - as RDF data or HTML web pages - in 9 languages - Reusable - by anyone - under terms of Creative Commons BY-NC-ND 3.0 license Demo: Dewey Summaries as Linked Data http://dewey.info/class/641/ http://dewey.info/class/641/about.rdf http://dewey.info/class/641/about.en http://dewey.info/class/641/about.sv http://dewey.info/class/641/2009/06/about.ar.html http://dewey.info/class/641/2009/01/about.ar.rdf HTML view across all versions in all languages Data view across all versions in all languages HTML view of all versions in a specific language http://dewey.info/class/641/about.sv Data view of a specific version in a specific language http://dewey.info/class/641/2009/06/about.ar.rdf And it works on my BlackBerry ... Thank you! What would you like to do with this? Ideas for new use cases? Other comments, suggestions? [email protected]